Two older houses on the Canadian border, one open and the other still sealed (for now, someone cut the screens on the windows so its only a matter of time). The open white one is still in good shape for sitting 12 years (if the calender left behind is correct). The red and white one looks clean inside from the windows. Although these houses are on a busy road, i parked in the driveway and took my time inside, no one stopped or bothered me.
Update Sept. 2013 - These two houses are completely gone. Two patches of dirt are all that remain.